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General Architecture 15
Table 2 describes typical equipment configurations and specifications of external
PoE power system.
The external PoE power system has monitor function. It provides one system
monitoring module, one RS232 and two RS485 monitoring interfaces. The system
monitoring module reports the running information of the PSUs in the system to a
fabric through RS232 or RS485 interface and indicates alarm status by the alarm
LED (ALM). You can connect cables to the interfaces from the front as well as the
rear of the frame.
n
The external PoE power system for the Switch 8800 Family only supports the
RS485 monitoring interface.
MBUS Introduction
The MBUS is a service-independent maintenance and test bus. No service traffic
goes through the MBUS. The shutdown and reset of the MBUS does not affect the
services on the switch, and faults that have occurred on modules do not affect the
MBUS.
Through the MBUS, the system instructs the MBUS modules on individual cards to
power on/off the cards one by one in turn, thus prevent power surging. The MBUS
module software must support online upgrade.
Table 2 Typical equipment configurations and specifications of external PoE power system
Item Description
Physical dimensions (H x W x D) 177 x 486 x 320.5 mm (7.0 x 19.1 x 12.6 in.)
System controller One
Rectifier Two NP2500UAC (required) + one redundant
NP2500UAC (optional)
AC accessory Three AC inputs and switches
Three-phase AC voltage detection circuit
Input voltage range: 90 to 290 VAC; rated voltage
and current: 250 VAC, 20 A
DC accessory A single DC output, with max output current of
93 A
Max power consumption 4500 W
Table 3 LEDs of external PoE power system
LED Label Color
Normal
state
Abnormal
state Abnormal reason
Input power LED AC Green ON OFF Loss of AC input power, or blown
fuse
Output power LED DC Green ON OFF No DC output from PSU
Fault LED Fault Red OFF ON Irreversible fault occurred in PSU
Running status LED RUN Green ON OFF PSU shutdown or PSU running
trouble
Alarm LED ALM Red OFF ON Loss of AC input power,
under-voltage or over-voltage
input, under-voltage or
over-voltage output, or PSU fault